Fireproof construction.



PATENTED JUNE 16, 1903.

N. PELLIGREEN. FIREPROOP CONSTRUCTION.

APPLICATION FILED MAR. 12, 1903.

N0 MODEL.

No. 731,216. PATENTBD JUNE 16, 1903. N. PELLIGREEN.

FIREPROOF CONSTRUCTION.

APPLICATION FILED MAR. 12, 1903. N0 MODEL. r 3 SHEETS-SHEET 2.

m: NORRIS virus :0. PNOTO-LITHO. WASHINGTON. o r.

No. 731,216. PATENTED JUNE 16, 1903. N. PELLIGREEN. FIREPROOPCONSTRUCTION.

UNITED STATES Patented June 16 1903.

PATENT OFFICE.

FIREPROOF CONSTRUCTION.

SPECIFICATION formingpart of Letters Patent No. 731,216, dated June 16,1903.

Application filed March 12, 1903. Serial No. 147,387. (No model.) I

To (0Z5 whom, it may concern:

Be itknown that I, NICHOLAS PELLIGREEN, a citizen of the United States,residing at St. Louis, State of Missouri, have invented certain new andusefullmprovements in Systems of Fireproof Construction, of which thefollowing is a specification containing a full, clear, and exactdescription, reference being had to the accompanying drawings, forming apart hereof.

My invention relates to an improved system of fireproof construction foruse in steelframe buildings and the like, and has for its object toprovide a system for building con crete floors having a high factor ofsafety with materials of the smallest possible weigh t, bulk, andexpense.

In the drawings which form a part of this specification, Figure 1 is aperspective of a floor, the floor being partly filled in with concrete.Fig. 2 is a transverse vertical section of a floor embodying myinvention. Fig. 3 is a transverse vertical sectional View of an I- beamemployed in my system of building construction, showing the manner inwhich I apply a casing of concrete provided with metallic bonds to thesame.

In the drawings the numeral 1 indicates I-beams, upon which the rails 2are laid transversely. The rails 2 are of the ordinary Wellknown form ofrailway-rails of any desired weight.

My floor is constructed by placing a temporary decking between theI-beams 1 at a plane lower than the plane of the top flanges of saidI-beams. Concrete is then imposed upon the decking and around the rails2 until it has attained the plane of the tops of the rails 2. At thispoint I superimpose upon the top surface of the concrete and over thetops of the rails 2 an interstitial web 3 and then proceed to addconcrete until the floor is of the desired thickness. As shown in Fig.1, the interstitial web employed is preferably the ordinarypoultry-fencing, which is of sufficient tensile strength when introducedat or near the neutral axis of the concrete to act as sufficient bond.The floor resulting from my construction is the monolithic mass 4, whichcompletely embraces the interstitial web 3, the rails 2, and the topflanges of the I-beams 1.

I am awarethat heretofore interstitial webs of various materials havebeen employed as a bond in the protection of concrete slabs; buthitherto in the art such interstitial web has been usually made ofheavier and more expensive material than the poultry-netting specifiedby me, and the interstitial web has been relied upon as the source ofthe tensile strength of the resulting floor, wall, or ceiling structure.In the system of my invention, however, I have preferred to gain tensilestrength by the employment of the ordinary railway T-rails, which areuniversally available for the purpose and which may be installed withminimum expense. I utilize the tensile strength of the rails 2 byplacing them at and beneath the neutral axis of the floor, as shown insection in Fig. 2, that portion of the concrete below the level of therails 2 being used only for the purpose of protecting the bottoms of therails 2 and the upper flanges of the I-beams 1 from exposure to theatmosphere or dampness and consequent oxidation. In order to securesimilar protection for the I-beams 1, I have provided a protectivecovering for said I- beams, which is shown in section in Fig. 3

and which may be described as follows: I

have provided sections 5, having inwardlyprojecting longitudinaldepressions 6 to re-,

ceive the upper and lower flanges of theI- beams. The concrete is moldedto form internal vertical strengthening-ridges 7 and projections 8,which are of the desired length to hold the sections 5 at the properdistance from the webs of the I-beams 1. Each of the sections 5 isprovided with the interstitial Web 9,preferably of poultry-uetting,asbefore. The outer ends of the rails of which the interstitial web 9 iscomposed project from the tops and bottoms of the sections 5, and afterthe sections are put in place about the I- beams 1 the said ends arebrought together and twisted at the top of the I-beams, as indicated bythe numeral 10, and brought together and twisted at the bottom of the I-beams, as indicated by the numeral 11,whereby the I-beams are completelyincased and the sections 5 held together upon both sides of the I-beams.When this form of protective structure for the I-beams is employed, thesections 5 are first placed in position ICO about the I-beams. Thedecking or centering is then placed in position, and the floor or slab 4is built up to the outer sides of the sections 5, as indicated in Fig.3.

Having fully described myinvention, what I claim as new, and desire tohave secured to me by the grant of Letters Patent, is

In a system of fireproof construction, a protective covering forhorizontal I-beams consisting of the sections 5 provided with the ridges7, projections 8 and depressions 6, and interstitial metallic webembedded in the sections, and having its ends projecting to form meanswhereby the sections may be united to surround and incase the I-beams,substantially as and for the purposes specitied.

In testimony whereof I have signed my name to this specification inpresence of two subscribing witnesses.

NICHOLAS PELLIGREEN.

\Vitnesses:

M. G. IRION, JOHN C. HIGDON.

